Current Sensor: ACS755xCB-050

Transcription

1 Package CB-PFF 5 4 The Allegro ACS75x family of current sensors provides economical and precise solutions for current sensing in industrial, automotive, commercial, and communications systems. The device package allows for easy implementation by the customer. Typical applications include load detection and management, power supplies, and overcurrent fault protection. The device consists of a precision, low-offset linear Hall sensor circuit with a copper conduction path located near the die. Applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional voltage. Device accuracy is optimized through the close proximity of the magnetic signal to the Hall transducer. A precise, proportional voltage is provided by the low-offset, chopperstabilized BiCMOS Hall IC, which is programmed for accuracy at the factory. The output of the device will be valid when the current flows from pin 4 to pin 5. The internal resistance of this conductive path is typically 100 μω, providing low power loss. The thickness of the copper conductor allows survival of the device at up to 5 overcurrent conditions. The terminals of the conductive path are electrically isolated from the sensor leads (pins 1 through 3). This allows the ACS75x family of sensors to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques Package CB-PSF Package CB-PSS 5 4 The device is fully calibrated prior to shipment from the factory. The ACS75x family is lead-free. All leads are coated with 100% matte tin, and there is no lead inside the package. The heavy gauge leadframe is made of oxygen-free copper Pin 1: VCC Pin 2: GND Pin 3: VOUT Terminal 4: IP+ Terminal 5: IP AB SO LUTE MAX I MUM RAT INGS Supply Voltage, V CC...16 V Reverse Supply Voltage, V RCC V Output Voltage, V OUT...16 V Reverse Output Voltage, V ROUT V Output Current Source, I OUT(Source)... 3 ma Output Current Sink, I OUT(Sink)...10 ma Operating Temperature, Ambient, T A, L range to 150ºC Ambient, T A, S range to 85ºC Maximum Junction, T J(max) C Maximum Storage Temperature, T S to 170 C TÜV America Certifi cate Number: U8V Features and Benefits Monolithic Hall IC for high reliability Single +5 V supply 3 kv RMS isolation voltage between terminals 4/5 and pins 1/2/3 18 khz bandwidth Automotive temperature range End-of-line factory-trimmed for gain and offset Ultra-low power loss: 100 μω internal conductor resistance Ratiometric output from supply voltage Extremely stable output offset voltage Small package size, with easy mounting capability Output proportional to ac and dc currents Applications Automotive systems Industrial systems Power conversion Battery monitors Use the following complete part numbers when ordering: Part Number Signal Pins Terminals Ambient ACS755LCB-050-PFF Formed Formed ACS755LCB-050-PSF Formed Straight 40 to 150 C ACS755LCB-050-PSS Straight Straight ACS755SCB-050-PFF Formed Formed ACS755SCB-050-PSF Formed Straight 20 to 85 C ACS755SCB-050-PSS Straight Straight

4 Defi nitions of Accuracy Characteristics Sensitivity (Sens): The change in sensor output in response to a 1 A change through the primary conductor. The sensitivity is the product of the magnetic circuit sensitivity (G/ A) and the linear IC amplifier gain (mv/g). The linear IC amplifier gain is trimmed at the factory to optimize the sensitivity (mv/a) for the full-scale current of the device. Noise (V NOISE ): The product of the linear IC amplifier gain (mv/g) and the noise floor for the Allegro Hall effect linear IC ( 1 G). The noise floor is derived from the thermal and shot noise observed in Hall elements. Dividing the noise (mv) by the sensitivity (mv/a) provides the smallest current that the device is able to resolve. Linearity (E LIN ): The degree to which the voltage output from the sensor varies in direct proportion to the primary current through its full-scale amplitude. Nonlinearity in the output can be attributed to the saturation of the flux concentrator approaching the full-scale current. The following equation is used to derive the linearity Nonlinearity (%) = 100 where Vout_¼ full-scale I P (V) is the output voltage when the sensed current approximates 0.25 I P(max), and Vout_¾ full-scale I P (V) is the output voltage when the sensed current approximates 0.75 I P(max). Quiescent output voltage (V OUT(Q) ): The output of the sensor when the primary current is zero. For a unipolar supply voltage, it nominally remains at 0.6 V. Variation in V OUT(Q) can be attributed to the resolution of the Allegro linear IC quiescent voltage trim, magnetic hysteresis, and thermal drift. Electrical offset voltage (V OE ): The deviation of the device output from its ideal quiescent value due to nonmagnetic causes. Magnetic offset error (I ERROM ): The magnetic offset is due to the residual magnetism (remnant field) of the core material. The magnetic offset error is highest when the magnetic circuit has been saturated, usually when the device has been subjected to a full-scale or high-current overload condition. The magnetic offset is largely dependent on the material used as a flux concentrator. The larger magnetic offsets are observed at the lower operating temperatures. Accuracy (E TOT ): The accuracy represents the maximum deviation of the actual output from its ideal value. This is also known as the total ouput error. The accuracy is illustrated graphically in the Output Voltage versus Current chart on the following page. Accuracy is divided into four areas: 0 A at 25 C: Accuracy of sensing zero current flow at 25 C, without the effects of temperature. 0 A over temperature: Accuracy of sensing zero current flow including temperature effects. 1 Vout _3/4 full-scale I P V OUT(Q) 3 Vout _1/4 full-scale I P V OUT(Q) Full-scale current at 25 C: Accuracy of sensing the full-scale current at 25 C, without the effects of temperature. Full-scale current over Δ temperature: Accuracy of sensing full-scale current flow including temperature effects. 4

7 Defi nitions of Dynamic Response Characteristics Propagation delay (t PROP ): The time required for the sensor output to reflect a change in the primary current signal. Propagation delay is attributed to inductive loading within the linear IC package, as well as in the inductive loop formed by the primary conductor geometry. Propagation delay can be considered as a fixed time offset and may be compensated. I (%) Primary Current 90 Transducer Output 0 Propagation Time, t PROP t Response time (t RESPONSE ): The time interval between a) when the primary current signal reaches 90% of its final value, and b) when the sensor reaches 90% of its output corresponding to the applied current. I (%) Primary Current 90 Transducer Output 0 Response Time, t RESPONSE t Rise time (t r ): The time interval between a) when the sensor reaches 10% of its full scale value, and b) when it reaches 90% of its full scale value. The rise time to a step response is used to derive the bandwidth of the current sensor, in which ƒ( 3 db) = 0.35 / t r. Both t r and t RESPONSE are detrimentally affected by eddy current losses observed in the conductive IC ground plane and, to varying degrees, in the ferrous flux concentrator within the current sensor package. I (%) Primary Current Transducer Output Rise Time, t r t 7

10 Package CB-PSF Package CB-PSS The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such de par tures from the detail spec i fi ca tions as may be required to permit improvements in the per for mance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro products are not authorized for use as critical components in life-support devices or sys tems without express written approval. The in for ma tion in clud ed herein is believed to be ac cu rate and reliable. How ev er, Allegro MicroSystems, Inc. assumes no re sponsibility for its use; nor for any in fringe ment of patents or other rights of third parties which may result from its use. Copyright 2005, AllegroMicrosystems, Inc. 10

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